Discovered that I had a small area of fuel seepage at the tank feed elbow (3/8") with a circular hairline crack. The elbow moved slightly and I suspected it would be an issue (1973 Datsun 240z). Researched this product and purchased because of its capability to cure when wet. I was able to dry the area completely. Prepped with small wire brush, fine sandpaper, 3m pad and 70% rubbing alcohol. Cut off what I needed and began kneading the product (use latex gloves or similar). Applied to area and allowed to cure (1 hr) before painting. Not only did it cure rock hard and stop the leak, but it also stengthened the tank elbow so this will not be a concern in the future. Thank you JB Water Weld!